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Redox equilibrium of samarium ions doped in Al2O3–SiO2 glasses by Masayuki Nogami; Tatsuki Hagiwara; Go Kawamura; El-Sayed Ghaith; Tomokatsu Hayakawa is a Materials Science article available to read on EtoBox.
What is Redox equilibrium of samarium ions doped in Al2O3–SiO2 glasses about?
Redox reaction of samarium ions doped in Al 2 O 3 -SiO 2 glasses, prepared by a rapid cooling technique of the melts, was examined by the measurement of the optical absorption and fluorescence properties. It was found that the doped samarium ions are easily reduced and oxidized by heating in H 2 and O 2 gases, respectively. The redox kinetics of samarium in the H 2 and O 2 atmospheres obey good first-order kinetics. The activation energy for the Sm 3+ reduction in the 10Al 2 O 3 90SiO 2 glass was estimated to be $70 kJ/mol, which decreased with the increasing Al 2 O 3 content. On the other hand, the activation energies for the oxidation were $90 kJ/mol, which only slightly depends on the glass composition. In these glasses, the samarium ions are preferentially surrounded by the Al-O polyhedra, where the oxygen ions are easily removed to form defect centers. It was concluded that the movement of the oxygen ions in the Al-O polyhedra determine the redox equilibrium of the samarium ions.
Who reads Redox equilibrium of samarium ions doped in Al2O3–SiO2 glasses?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Masayuki Nogami; Tatsuki Hagiwara; Go Kawamura; El-Sayed Ghaith; Tomokatsu Hayakawa
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-2313)
- Published
- 2007
- Language
- EN
- Field
- Materials Science (Physical Sciences)